Mastercard at US offshore casinos: deposits work sometimes - better odds than Visa, but your bank decides via MCC 7995. Big national banks (Bank of America, Wells Fargo) often decline; credit unions and debit cards do best. Watch for cash-advance fees and same-day interest. You can't withdraw to Mastercard, so plan to cash out in crypto.
Visa is the payment method most people try first at US offshore casinos. It's also the one that fails most often. Success rate ranges from 50% to 80% depending on your bank, with major issuers blocking transactions coded under MCC 7995 (Visa's gambling merchant category). Deposits sometimes work. Withdrawals back to Visa rarely do. This guide covers which banks block, which offshore casinos process Visa most reliably, prepaid card workarounds, and when to switch to Bitcoin.